CA2344302A1 - Linear predictive analysis-by-synthesis encoding method and encoder - Google Patents

Linear predictive analysis-by-synthesis encoding method and encoder Download PDF

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Publication number
CA2344302A1
CA2344302A1 CA002344302A CA2344302A CA2344302A1 CA 2344302 A1 CA2344302 A1 CA 2344302A1 CA 002344302 A CA002344302 A CA 002344302A CA 2344302 A CA2344302 A CA 2344302A CA 2344302 A1 CA2344302 A1 CA 2344302A1
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Prior art keywords
gains
encoder
subframes
vector
state
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CA002344302A
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French (fr)
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CA2344302C (en
Inventor
Erik Ekudden
Roar Hagen
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Telefonaktiebolaget LM Ericsson AB
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/12—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] vocoders
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/083—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being an excitation gain

Abstract

A linear predictive analysis-by-synthesis encoder includes a search algorithm block (50) and a vector quantizer (58) for vector quantizing optimal gains from a plurality of subframes in a frame. The internal encoder states are updated using (50, 52, 54, 56) the vector quantized gains.

Claims (14)

1. A linear predictive analysis-by-synthesis coding method, characterized by determining optimum gains of a plurality of subframes;
vector quantizing said optimum gains; and updating internal encoder states using said vector quantized gains.
2. The method of claim 1, characterized by storing an internal encoder state after encoding of a subframe with optimal gains;
restoring said internal encoder state after vector quantization of gains from several subframes; and updating said internal encoder states by using determined codebook vectors and said vector quantized gains.
3. The method of claim 2, characterized by said internal filter states including an adaptive codebook state, a synthesis filter state and a weighting filter state.
4. The method of claim 1, 2 or 3, characterized by vector quantizing gains from 2 subframes.
5. The method of claim 1, 2 or 3, characterized by vector quantizing all gains from all subframes of said frame.
6. The method of claim 1, characterized by:
weighting error contributions from different subframes by weighting factors;
and minimizing the sum of the weighted error contributions.
7. The method of claim 6, characterized by each weighting factor depending on the energy of its corresponding subframe.
8. A linear predictive analysis-by-synthesis encoder, characterized by a search algorithm block (50) for determining optimum gains of a plurality of subframes;
a vector quantizer (58) for vector quantizing said optimum gains; and means (50, 52, 54, 56) for updating internal encoder states using said vector quantized gains.
9. The encoder of claim 8, characterized by means (52, 54, 56) for storing an internal encoder state after encoding of a subframe with optimal gains;
means (50) for restoring said internal encoder state after vector quantization of gains from several subframes; and means (50) for updating said internal encoder states by using determined codebook vectors and said vector quantized gains.
10. The encoder of claim 9, characterized by said means for storing internal filter states including an adaptive codebook state staring means (52), a synthesis filter state storing means (54) and a weighting filter state storing means (56).
11. The encoder of claim 8, 9 or 10, characterized by means for vector quantizing gains from 2 subframes.
12. The encoder of claim 8, 9 or 10, characterized by means for vector quantizing all gains from all subframes of a speech frame.
13. The encoder of claim 8, characterized by:
means (58) for weighting error contributions from different subframes by weighting factors and minimizing the sum of the weighted error contributions.
14. The method of claim 13, characterized by means (58) for determining weighting factors that depend on the energy of corresponding subframes.
CA2344302A 1998-09-16 1999-08-24 Linear predictive analysis-by-synthesis encoding method and encoder Expired - Lifetime CA2344302C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9803165-1 1998-09-16
SE9803165A SE519563C2 (en) 1998-09-16 1998-09-16 Procedure and encoder for linear predictive analysis through synthesis coding
PCT/SE1999/001433 WO2000016315A2 (en) 1998-09-16 1999-08-24 Linear predictive analysis-by-synthesis encoding method and encoder

Publications (2)

Publication Number Publication Date
CA2344302A1 true CA2344302A1 (en) 2000-03-23
CA2344302C CA2344302C (en) 2010-11-30

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CA2344302A Expired - Lifetime CA2344302C (en) 1998-09-16 1999-08-24 Linear predictive analysis-by-synthesis encoding method and encoder

Country Status (15)

Country Link
US (1) US6732069B1 (en)
EP (1) EP1114415B1 (en)
JP (1) JP3893244B2 (en)
KR (1) KR100416363B1 (en)
CN (1) CN1132157C (en)
AR (1) AR021221A1 (en)
AU (1) AU756491B2 (en)
BR (1) BR9913715B1 (en)
CA (1) CA2344302C (en)
DE (1) DE69922388T2 (en)
MY (1) MY122181A (en)
SE (1) SE519563C2 (en)
TW (1) TW442776B (en)
WO (1) WO2000016315A2 (en)
ZA (1) ZA200101867B (en)

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* Cited by examiner, † Cited by third party
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US8027242B2 (en) 2005-10-21 2011-09-27 Qualcomm Incorporated Signal coding and decoding based on spectral dynamics
US8392176B2 (en) 2006-04-10 2013-03-05 Qualcomm Incorporated Processing of excitation in audio coding and decoding
US8428957B2 (en) 2007-08-24 2013-04-23 Qualcomm Incorporated Spectral noise shaping in audio coding based on spectral dynamics in frequency sub-bands
JP5326465B2 (en) 2008-09-26 2013-10-30 富士通株式会社 Audio decoding method, apparatus, and program
JP5309944B2 (en) * 2008-12-11 2013-10-09 富士通株式会社 Audio decoding apparatus, method, and program
CN102985966B (en) * 2010-07-16 2016-07-06 瑞典爱立信有限公司 Audio coder and decoder and the method for the coding of audio signal and decoding
EP2761616A4 (en) * 2011-10-18 2015-06-24 Ericsson Telefon Ab L M An improved method and apparatus for adaptive multi rate codec
US20230336594A1 (en) * 2022-04-15 2023-10-19 Google Llc Videoconferencing with Reduced Quality Interruptions Upon Participant Join

Family Cites Families (14)

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Publication number Priority date Publication date Assignee Title
DE69029120T2 (en) * 1989-04-25 1997-04-30 Toshiba Kawasaki Kk VOICE ENCODER
JP2776050B2 (en) * 1991-02-26 1998-07-16 日本電気株式会社 Audio coding method
SE469764B (en) * 1992-01-27 1993-09-06 Ericsson Telefon Ab L M SET TO CODE A COMPLETE SPEED SIGNAL VECTOR
EP0577488B9 (en) * 1992-06-29 2007-10-03 Nippon Telegraph And Telephone Corporation Speech coding method and apparatus for the same
IT1257431B (en) * 1992-12-04 1996-01-16 Sip PROCEDURE AND DEVICE FOR THE QUANTIZATION OF EXCIT EARNINGS IN VOICE CODERS BASED ON SUMMARY ANALYSIS TECHNIQUES
CA2118986C (en) * 1994-03-14 1998-09-22 Toshiki Miyano Speech coding system
US5651090A (en) * 1994-05-06 1997-07-22 Nippon Telegraph And Telephone Corporation Coding method and coder for coding input signals of plural channels using vector quantization, and decoding method and decoder therefor
SE504397C2 (en) * 1995-05-03 1997-01-27 Ericsson Telefon Ab L M Method for amplification quantization in linear predictive speech coding with codebook excitation
CN1100396C (en) * 1995-05-22 2003-01-29 Ntt移动通信网株式会社 Sound decoding device
DE69620967T2 (en) * 1995-09-19 2002-11-07 At & T Corp Synthesis of speech signals in the absence of encoded parameters
KR100277096B1 (en) * 1997-09-10 2001-01-15 윤종용 A method for selecting codeword and quantized gain for speech coding
US6199037B1 (en) * 1997-12-04 2001-03-06 Digital Voice Systems, Inc. Joint quantization of speech subframe voicing metrics and fundamental frequencies
US6260010B1 (en) * 1998-08-24 2001-07-10 Conexant Systems, Inc. Speech encoder using gain normalization that combines open and closed loop gains
US6104992A (en) * 1998-08-24 2000-08-15 Conexant Systems, Inc. Adaptive gain reduction to produce fixed codebook target signal

Also Published As

Publication number Publication date
AU756491B2 (en) 2003-01-16
BR9913715A (en) 2001-05-29
US6732069B1 (en) 2004-05-04
JP2002525897A (en) 2002-08-13
EP1114415B1 (en) 2004-12-01
ZA200101867B (en) 2001-09-13
SE9803165L (en) 2000-03-17
CN1132157C (en) 2003-12-24
AR021221A1 (en) 2002-07-03
SE9803165D0 (en) 1998-09-16
TW442776B (en) 2001-06-23
KR20010075134A (en) 2001-08-09
WO2000016315A3 (en) 2000-05-25
WO2000016315A2 (en) 2000-03-23
CN1318190A (en) 2001-10-17
CA2344302C (en) 2010-11-30
JP3893244B2 (en) 2007-03-14
SE519563C2 (en) 2003-03-11
AU6375799A (en) 2000-04-03
EP1114415A2 (en) 2001-07-11
MY122181A (en) 2006-03-31
KR100416363B1 (en) 2004-01-31
BR9913715B1 (en) 2013-07-30
DE69922388D1 (en) 2005-01-05
DE69922388T2 (en) 2005-12-22

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